Wrench



sept. 14, 1943. A. BOYNTON 2,329,181

' WRENCH Filed April 8, 1939 2 Sheets-Sheet l ALEXANDER 50 wv o/v,

Afro/iwf ys Sept. 14, 1943.

A. BOYNTON 2,329,181

WRENCH l Filed April 8, 1939 2 sheets-sheet 2 from/frs.

yPatented Sept. 14, 1943 y, n u

n WRENCH Alexander Boynton, San ntoniio, Tex. Application April s, 1939,seri-a1 no; 266,758

4 Claims.

My invention relates to wrenches or tongs and particularly; to pipewrenches.-

The objects are to provide a wrench that (1) y will not mash the pipe,(2) will not score or cut the pipe by deeply embedding teeth', as manyother wrenches do, (3) will not slip on the pipe, (4) maybe quicklyapplied.

I accomplish the foregoing objects by means of a plurality 'of pipegripper dogs urged inwardly by a roller engaging between twov sur-lfaces, one of whichis eccentric to the pipe; these rollers beingnormally urged by a spring adapted to hold pipe grippers apart so as toadmit the pipe, as will more fully appear from the accompanying drawingsin which: A

Fig. 1 is a top plan view of the preferred form ofthe wrench Fig. 2 is asection on the line 2 2, Fig. 3.

in Figs. 1 and 2. x

Fig. 4 is a section on the line 4--4, Fig. 1.

Fig. 5 is a side view of one ofthe rollers.

Fig. 6 is an end View of oneof the pipe grippers in Fig. 2.

Figure 3 is a sideY view'of the wrench shown- Fig. 7 is an inside viewof the part'shown in Fig. 6. c

Fig.r 8 is a top view of a modified form of the wrench shown in Figs. 1,2, and 3.

jaw to'retain the tong about the pipe and in gripping position.

The angle between arm la and a line tangent to groove 1a at the pointwhere the roller wheel 2 rst contacts this' groove when the handle'rmember I is moved clockwise,- is'such that the roller wheel will urgepipe gripper dogs together, as appears in Figs. 1 and 2.- The stopbumper extension Ib is adapted to engage upon the surfacev5con the head5 when the handle memv ber VI has been rocked anti-clockwise withrelation to the shells 5 and 1 far enough to allow'shell 1 to clear the'roller wheel 2 as'the wrench is opened. 'Ihe shell 1,'hinging upon boltB, may then be opened far enough to admit y the pipe I8; the furtheropening swing of shell The teeth ISb-are concentric with-pipe I8., but

the teeth 5a, are tangent to a circle somewhat larger thanY the pipe, soVthat the pipe grippers I5l will be forced inward upon pipe I8 when they rollers I2 are caused to turn clockwise by the handle member lI beingmoved so that the roller wheel 2 will engage'within the groove 1a of theshell 1. The number of teeth 5a and I5b'and the direction of the tangentare such that the:

rollers I2, in their travel, will permitthe pipe grippers I5 toexpandfar enough to loosely sur- Fig. 12 is an end view of the pipegripper'in Fig. 9.

Fig. 13 is an inside view of the part shownin Similar charactersA referto similar parts throughout the several views of each embodiment.

With' particular reference to Figs. 1, 2, and 3, the handle member I ishinged to double hinged shell or head 5 by a hinge bolt 4; the singlehinged shell or -jaw 1 being also hinged upon head v5 by a hinge bolt 6.The arm Iaof handle member 'I' has `its extremity forked to receivev theroller wheel 2 mounted within the forks upony axle bolt 3.r 'I'he groove1a., exterior of shell 1,

vis `adapted to receive the roller vwheel 2 for sufycient depth to actas a guide for the roller in the path of its travel. The length ofgroove 1av tractedpositions upon pipe I8 so that the roller I 2transmits 'a thrust from the handle I to the round the piper I 8 andcontract enough to engage the teeth I5a so tightly upon the pipe thatthe wrench and pipe will'then turn together.

Each'of the rollers I2 are formed with a short a flange 'I Ia engagingwithin grooves I5c in thel pipe grippers I5 as seen in Figs. 2, 6, and7. This engagement of the flanges IIa within secures the assembly ofpipe grippers I5.

rFlat springs I6, secured upon flanges Ilotby4 rivets I1 (see Fig. 2) tinto the grooves I5c and are adapted to resiliently urge the pipe gripepers I5 upon the rollers I2 which are thereby kept en meshed with'theirmating teeth on both sides, as appears in Fig. 2.

"Each of the's'pring wires I3 hasl one end received within an openingthru the long spindle I2C Where it may be secured by electric spot weldI3a, see Fig. 5. These spring wires, exerting an unwinding torque, areinstalled wrapped partially around the spindles I2c and arereceivedmatically engage near or between the end teethV indicated at Saaand lbb, Fig. 2; this being the most open position of the pipe grppersl5. 'l J= To apply the wrench,` shell l is, swung` open 5 to admit thepipe I8. The handle member I` is` then moved toward the operator, who isassumed to be positioned on the roller wheel side of the v wrench.` Asnappy pull of the handle will then cause theroller wheel 2 to; trayelclockwise *inv slot la; thereby urging the slr1ells5-5-y and-.l toward*Aeach otherand the pipe gripperslEaupon-I the pipe by therolling actionof. rollersjlZ which then turn. clockwise and. travel away from.l theendteeth Baa and'wiibo while the pipe grippers4 are closing` uponthepipe.y i Thefwrench., may be free-dl from the pipe kby y thrusting.thehandle away from the operator untilstop :bumper lbengages the surface5cat whichitime the; roller wheel 2 will-clear shell l and. permit thisshellY course, that the terms clockwise and anticlockwise, as relates tothe movements of the wrench handleand pipe gripper dogs, become reversedin both iorms of the invention as the wrench is reversed in operationfrom the positions vshown in the figures discussed by way ofillustration.

It is apparent that vmany minor changes and substitutions can be madewithin the scope of the stated objects and appended claims, and Ireserve theV right to make` such changes and substitutions.

What is claimed is: l. In a pipe wrench the combination of a pair of,jaws adapted to surround a pipe, pipe gripping dogs Awithin said jaws, aloose eccentric tongue and "groove connection between said jaws and dogswhereby the dogs are movable radially to be openedA until stop bumperlS17-engages upon,

the surfaceY lo; thus conveniently arresting the.

openine-movementwhen the opening is ample to admitgtheppipe.

signa 9,- ane ioiliustrate. a modiiied form= The partsv of. the` ,modiedof `this invention.V form and of lthe preferred `form, indicated; by thesame reference characters, are thelsame in construction and purpose.Inthe `modication all -parts are primed whereI these partslareessentially diiierent from theI somewhat similar partsinthe preferredform; While-several parts; iin 4themodification closely resemble similarparts in the preferred form, there arel essential dif'-y ierences;the-principal difference being, thatthe teethon pipe grippers areeccentric. refer@ ence `to )the pipe` and the teeth inthel shell areVconof-mtricy therewith in this form; while in the;k

preferred Vforni the teethy on pipe.. grippers .are concentricwithreferenceto the` pipe andthe teeth inthe shell are tangentyto-acircle some-f what larger than the diametep `oft the pipe upon which thewrenchis adapted'to.be` used.E

By referring to the 1z referredV {or-nn illustrated in Figs. 1 to '7,both' inclusive,and,ft he. specification thereof, the constructionof.thisf-modifica7 tion willl .be clearly understood; attention beingdirectedto the fact thatthe only partsinthe.

modincauon which essentially. meeneem, the

n will be noted in Eig'. amat the' pipe-grip:-

pers l5', having lteeth laf to engage the pipe, are eccentric withreference to the pipe, inforden.

to provide a thickening` of the grippers toward one end in orderthat'fthe v*teeth |5115; 4coa'cting v with the concentricvteeth 5o oithehinged shells 5.' and l,`A will urge thefpipe ,gripper's .upon vthe pipewhen v.the wrench` handle v ismovedl clockwis and away' from the pipe.when tlifejliandleis" moved anti-clockwise.` Ituwill be 'understoodgofand circumferentially, opposed converging surfaces on said dogs andjaws, and roller means between. and. having a.V driving connection withsaid surfaces forlhQYihg the dogs;inwardlywhen*v the; jaws, are,Yrotated relative to the dogs.`

f 2. In a pipe wrench .the combination of4 a pair of.jawsl adapted to`surround a pipe, pipe grip--v ping Vdogs within. said jaws. and movablerelative thereto, opposed converging surfaces on said' jaws and dogs,and rollers drivablyA engaging said surfaces. and `adapted to urge thedogs'- inwardly when a rotative eilort is applied to therjaws to urgetherollers in the direction of.I convergence;y and resilient means normallytend-ing torotate said rollersv and move the dogs to retractedIposition.

3.- In a pipe wrenclnthe .combination of a pair or.` jaws adaptedy tosurround a pipe, means for pipe,y a roller having teeth engageablebetween'.V

Vmeans-,on said; rollers to normally-position same soap,tdsresilientlyfhold, said grippers radially expanded.

, 4., In alpipe wrench, a jaw. assembly including arpair of. jawsadapted to surround a pipe, means'v forwholdingd. :said jaws. inApredeterminedrelative position about. the pipepipe gripperdogs-within,

saidwjaws, said grippers having internal teeth.'

conforming withand adapted toV embed.' within said pipeto'inipartrotaryiforce theretopafI group.'- of teethon, the exterior-'of each of;saidl gripper/s.'

ariangedeocentrically ,relative to the intenna'lzteeth. spaced, groupsofY concentric-.teeth opposed; tolsai'd` groupsinterior of said jaws,ra' rollerH h'aJ/i11g-teeth| engageable between each pair;A of: saidopposedgroups, a` looseannular tongueiand;` groove connection. betweensaid .jaws` andf grip-f.1

pei-sandr n'ieans` thereinv for radially orcingsaldau grippers, toengage saidrollers between?, said.` opy; i

P'Qsel groups??? teeth', means, Ona said rollers-tof 1 normally positionsame soy as` to` resilier1tl5-.-hgoldzV saidgrippers-radially expanded.Y

